A METHOD FOR CHANNEL MEASUREMENT AIMED AT REDUCING CLI

Abstract

This is a method for channel measurement to reduce cross-linking interference (CLI) in a system containing base stations (100) that can communicate using sub-band full duplex (SBFD) technology, where the base stations (100) have N number of channel status information (CSI) ports and a central controller (10) to control the base stations (100). The method involves a two-step reference signal configuration that first uses a low number of ports, then a higher number of ports depending on the CLI level measured in the first part. The method then performs a beam zeroing operation depending on the reference signal measurements of the second part.

Description

1 TARIFF A METHOD FOR CHANNEL MEASUREMENT AIMED AT REDUCING CLI TECHNICAL FIELD The invention enables communication using sub-band full duplex (SBFD) technology. To reduce cross-connection interference (CLI) in a system that includes stations. The channel relates to a method for measurement, where the base stations in question are numbered N. channel status information (CSI) port and to check the base stations in question. It has a central controller. 10 PREVIOUS TECHNIQUE Sub-band full duplex (SBFD) is included in the 3GPP Release to enhance the capabilities of 5G. It is a technology introduced in 19. This technology uses sub-bands within the same frequency band. It enables simultaneous signal transmission and reception between them, essentially the spectrum. It increases usage efficiency. Traditional duplexing methods include, for example, frequency division duplexing (FDD) and Time-division duplexing (TDD), downlink (DL) and uplink (UL) are 20 respectively. It uses different frequency bands or operates at different times. However, with SBFD, the spectrum... DL and UL simultaneously in the same frequency band but in different sub-bands. Because it allows for communication, it is used more efficiently, thus preventing interference. The SBFD concept allows for simultaneous transmission and reception on different sub-bands of the same frequency band. It enables 25, which is vital to support the increasing data demand on 5G networks. It increases spectrum efficiency. In traditional duplexing methods, the allocation of UL and DL resources is typically It is constant, which means there is a particularly variable and asymmetrical demand between DL and UL traffic. This can lead to inefficiencies. SBFD operates in 30 separate sub-bands of the same frequency band. Because it enables simultaneous DL and UL transmission, it allows for greater utilization of spectrum resources. It enables dynamic allocation. This flexibility allows for UL (Universal Qualifications Authority) allocation in case of high demand. This allows for an increase in resources without affecting DL traffic, thus making the spectrum more efficient. This leads to its use. 2 SBFD networks introduce a new approach not typically encountered in dynamic TDD (D-TDD). This reveals various scenarios. These initiatives involve SBFD operating within the same frequency band but in different sub-bands. This arises because it allows simultaneous transmission and reception across bands, and this includes subbands. This can potentially lead to cross-talk between them. The main issues that occur with SBFD are... Types of gNB-to-gNB interference include the following: 5 One of the most critical challenges in SBFD systems is self-interference. Self-interference Interference occurs when a signal transmitted from a device leaks into the reception subband of the communication. This occurs because the receiver, which reduces its quality, receives unwanted signals. This initiative will lead to decreased data speeds, increased error rates, and higher power requirements. This can lead to increased power consumption, significantly impacting system performance. Effectively address intrusion challenges in 5G networks, especially in SBFD scenarios. to incorporate advanced mitigation techniques into industry standards It is evolving. These methodologies primarily involve spatial domain strategies, time and frequency. 15 coordinated timing between areas, power control mechanisms and CLI measurement and It focuses on modeling techniques. One of the key approaches to reducing CLI from gNB to gNB is, in particular, Frequency. Beam zeroing (beam 20) has proven to be quite effective in the FR-1 range. This is the nulling method. During the beam nulling process, the acting gNB moves towards the affected gNB. It adjusts the pre-coding weights to create a null point. This damping process, channel between acting gNB and affected gNB and acting gNB This is done based on channel measurements between the EUs it serves. The adjustment minimizes the interference of the influencing gNB while simultaneously achieving an effective 25 with its UEs. It enables communication in this way. In SBFD systems, the beam zeroing process, channel Since both involve optimizing transmission based on their measurements, DL is multiple. User MIMO (DL MU-MIMO) is conceptually similar. Channel status information to measure the channel between the influencing and affected gNBs 30 Reference signals (CSI-RS) can be used. gNB, which is affected by the transmission of CSI-RS, This allows the affected gNB to measure the channel, then the affected gNB, channel It sends feedback on the situation to the party that influenced it. Based on this information, the party that influenced it, gNB, It can adjust its transmission to reduce interference via beam reset. More numerous 3 Using the CSI-RS port configuration allows for a more detailed description of the channel. It enables better understanding while also providing a more precise beam zeroing. In addition to measuring the channel of the affected gNB, the reverse process is also possible. The affected gNB, It can transmit CSI-RS and also allow the influencing gNB to measure the channel and pre-code accordingly. 5 This allows for optimization. This two-way exchange of channel information enables both gNBs to optimize SBFD. This allows them to effectively reduce CLI in their systems. The right channel. Beam zeroing, facilitated by measurements, minimizes interference between gNBs. It plays a critical role in maintaining system performance by reducing download speeds. The resolution and accuracy of these channel measurements depend on the number of CSI-RS ports used. They are directly related. By using a larger number of CSI-RS ports, the system becomes better. channel resolution can be obtained, especially by performing beam zeroing. This allows for more precise interference reduction in this situation. This higher channel Its resolution allows for a clearer understanding of the channel characteristics, making complex 15 This allows for fine-tuning of communication environments and thus better performance. He recognizes. However, increasing the number of CSI-RS ports introduces a trade-off. CSI-RS transmission is via Physical Downlink Shared Channel (PDSCH) or Physical Downlink 20 Valuable applications that can be used for actual data transmission, such as Link Control Channel (PDCCH). It uses time-frequency resources. This creates a balance: more The CSI-RS port enhances the ability to measure and mitigate interference, while also providing... It reduces the resources available for user data transmission. As a result, excessive CSI-RS occurs. Its use negatively impacts the total system data throughput, resulting in an inefficient spectrum. This leads to its use in this way. In the previous technique, channel and interference measurements were taken, especially within a network, involving many next-generation devices. In scenarios where multiple NodeBs (gNBs) are located together, beam reset techniques are used. It is crucial for activation. The correct channel between the influencing and affected gNBs is 30. Estimation is essential for effective initiative management; some solutions involve high-quality channels. It is recommended to use up to 128 CSI-RS ports to obtain the estimate. Many In a network where gNB is located, these neighboring base stations transmit channels from gNB to gNB. The measurements need to be carried out precisely, but in the current process there are many difficulties arise. 35 4 One of the main problems is the allocation of large amounts of resources for CSI-RS transmissions. This is necessary. In these solutions, neighboring gNBs orthogonally align the CSI-RS signals in time. It is planned to transmit in these time slots and other gNBs will transmit in these time slots. This requires listening to the sources. This approach is important only for periodic measurements. This results in the allocation of a large amount of resources, which can become a burden for the network. CSI-RS With these high resource demands required for the periodic transmission and reception of signals, the system Its efficiency decreases significantly, especially as the number of gNBs on the network increases. In addition, current methods can effectively analyze the dynamic interference relationships between gNBs. It does not take into account that a base station can simultaneously provide signals to different neighboring gNBs. In scenarios where one can be both affected and influencing, the previous technique involved these roles. a flexible and dynamic mechanism for defining and adapting to these roles This rigidity is not present. This rigidity allows for the dynamic identification of the influencing-affected pairs and CSI-RS is an adequate system for adjusting resource allocation accordingly. 15 Because it is not available, it leads to inefficient resource utilization. Additionally, the solutions in the previous technique have many cause-and-effect relationships. It does not offer sufficient support to address the scenarios. In such cases, each gNB is unnecessary. Even during times when this is the case, a significant portion of their resources are allocated to channel measurement and initiative management. Because it had to allocate a portion of the resources, current methods require more resources than necessary. This leads to over-provisioning. As a result, resource utilization is not optimized. This is not possible and network performance is negatively affected. In summary, the previous technique involved resource allocation, dynamic role definition, and 25 in multiple gNB networks. It shows shortcomings in terms of scalability, especially with many influencing-influenced pairs. This does not make it suitable for scenarios involving real-time intervention levels. This allows for a more harmonious definition of the influencing-influenced pairs and A solution is needed that will ensure the efficient allocation of resources. This can significantly improve network performance and resource efficiency. 30 WO2018223386A1 is used in wireless communication networks, especially for uplink (UL) communication. also the location of many base stations (gNB) operating on downlink (DL) channels. a method for measuring and controlling cross-linking attempt (CLI) in the scenarios it receives It describes the system and method. The system uses reference signals such as CSI-RS and DMRS to calculate 35 Measures CLI between gNBs and Cross-Connect Interference Reference Signal Received Power. (CLI-RSRP) and Cross-Connect Interference Reference Signal Received Signal Strength Indicator It includes various metrics such as (CLI-RSSI). All the problems mentioned above have made an innovation in the relevant technical field necessary. 5 A BRIEF DESCRIPTION OF THE INVENTION The present invention aims to eliminate the aforementioned disadvantages and to contribute to the relevant technical field. It is related to a method aimed at gaining new advantages. 10 One aim of the invention is to perform the beam reset required for CLI reduction. Significantly improves resource efficiency while achieving channel resolution levels. It is to increase it. To achieve all the objectives mentioned above and set out in the detailed explanation below. The present invention aims to achieve this by using sub-band full duplex (SBFD) technology. base stations capable of communication and having N channel status information (CSI) ports, and in a system consisting of a central control unit that controls these base stations, This relates to a channel measurement method aimed at mitigating cross-linking interference (CLI). 20 Accordingly, it is characterized by including the following steps: - 0 < M <N olacak şekilde, M sayıda porta sahip bir başlangıç port grubu determination, - either the first or second base station, starting port 25 using the group to send channel status information reference signal (CSI-RS) to the other transmission; - based on CSI-RS received by the other base station in the starting port group Performing CLI measurement; - CLI measurement 30 by either the first or second base station access to data; - A second group of ports with K ports such that M < K < N determination and determination of the K value according to the CLI measurement level, such that K, It increases if the CLI measurement level is higher, and the CLI measurement... It decreases if it is lower; 35 6 - using the second port group, from the first base station or the second base station One transmitting channel status information reference signal (CSI-RS) to the other; - based on CSI-RS received in the second port group from the other base station, CSI performing the measurement; - Base station 5 is the one affecting the area between the first and second base stations. the person having access to CSI measurement data; - the base station that acts between the first and second base stations The system performs beam zeroing based on CSI measurement data. This allows... Resource utilization while ensuring adequate beam zeroing performance. is being reduced. 10 A possible arrangement of the invention is the first base station affecting the base station (110) It is characterized by being and the second base station being the affected base station (120). It is done; it includes the following steps: - the second base station is connected by the first base station using the initial port group. Transmission of channel status information reference signal (CSI-RS) to the station; - based on CSI-RS received by the second base station at the initial port group. CLI measurement is performed as follows; - CLI measurement data is sent from the second base station to the first base station 20 transmission; - Access to CLI measurement data by the first base station; - A second group of ports with K ports such that M < K < N determination and adjustment of the K value according to the CLI measurement level, such that K, It increases if the CLI measurement level is higher and the CLI measurement is 25. It decreases if it is lower; - the second base station uses the second port group by the first base station. Transmission of channel status information reference signal (CSI-RS) to the station; - based on CSI-RS received by the second base station, second port group. Performing the CSI measurement; 30 - CSI measurement data is transmitted from the second base station to the first base station. transmission; - Access to CSI measurement data by the primary base station; - Beam reset based on CSI measurement data by the first base station. The process is carried out. 35 7 Another possible arrangement of the invention is the first base station acting as the influencing base station. It is characterized by the fact that the first base station is the affected base station and the second base station is the affected base station; This includes the following steps: - by the second base station, using the initial port group, the first base station Transmission of channel status information reference signal (CSI-RS) to the station, - CSI-RS received by the first base station on the initial port group Depending on the situation, CLI measurement is performed; - Accessing CLI measurement data by the first base station; 10 - A second group of ports with K ports such that M < K < N determination and adjustment of the K value according to the CLI measurement level, such that K, It increases if the CLI measurement level is higher, and the CLI measurement... It decreases if it is lower; - 15 by the second base station, using the second port group, to the first base station. Transmission of channel status information reference signal (CSI-RS), - connected to CSI-RS received on the second port group by the first base station. as a result of CSI measurement; - Accessing CSI measurement data via the primary base station; - Beam reset 20 based on CSI measurement data by the first base station. the execution of the process. Another possible arrangement of the invention would involve more than two neighboring base stations in the system. It is characterized by its presence and includes the following steps; - transmission of CSI-RS orthogonally by each base station; - each base station's CSI-RS transmitted by other base stations In a corresponding way, by configuring CSI-RS in their own resources, their own CSI-RS resources detect CLI caused by other base stations enabling measurement; 30 - CLI measurements on CSI-RS sources of each base station based on identifying itself as the affected or influencing base station or CLI measurements on CSI-RS sources of a central controller based on identifying base stations as either victim or attacker base stations Description. 35 8 BRIEF DESCRIPTION OF THE FIGURES Figure 1 shows CSI-RS using the starting port group of an influencing base station. It is a diagram showing an arrangement of the system that transmitted to the affected base station. 5 Figure 2 shows the case where the measured CLI of an impacting base station is relatively high. The system transmits CSI-RS to an affected base station using the second port group. It is a drawing showing the arrangement. Figure 3 shows the case where the measured CLI of an impacting base station is relatively low. The system transmits CSI-RS to an affected base station using the second port group. It is a drawing showing the arrangement. Figures 4-5-6 and 7 show an arrangement of a system where more than two base stations are provided. It shows. REFERENCE NUMBERS GIVEN IN THE FIGURE. Central controller 20 100 Base stations 110 Influencing base stations 120 Affected base stations DETAILED DESCRIPTION OF THE INVENTION 25 This detailed explanation is intended solely to make the subject more understandable. It is explained with references to examples without creating any restrictive effects. Referring to Figures 1-7, the system implementing the method uses a large number of base stations (100) and base 30 It includes a central controller (10) that controls its stations (100). Base The stations (100) can communicate using sub-band full duplex (SBFD) technology. Base station (100), arrays of antennas for forming a beam, different subbands transceiver modules capable of simultaneous transmission and reception, transmission and reception 9 Beamforming with filtering and duplexing components to separate and isolate signals. It includes signal processing units for beam generation algorithms and interference cancellation. Base stations contain (100) ports. The ports are used for signal processing of the base station (100). signal paths or interfaces that connect the units to the antenna elements—for example, RF 5 It refers to the chains or virtual antenna ports; the number of these ports is determined by what CSI does. This determines that it is obtained with such precise resolution. This is beamforming. optimizing the efficiency, signal quality, and spatial multiplexing of the system It directly affects their ability. This method involves two stages. In the first stage, an initial number of ports is determined. Cross-linking interference (CLI) is measured using, then in the second stage, the interference depending on the level (increasing as the level of involvement increases or decreasing as it decreases) A CSI measurement is performed with an updated port count. Then, as the influencing factor... Beam reset is performed by a defined base station (100). 15 The method involves the following steps: - 0 < M <N olacak şekilde, M sayıda porta sahip bir başlangıç port grubu determination, 20 - the starting port of either the first or second base station using the group to send channel status information reference signal (CSI-RS) to the other transmission (Figure 1); - based on CSI-RS received by the other base station in the starting port group Performing CLI measurement; 25 - CLI measurement by either the first or second base station. access to data; - A second group of ports with K ports such that M < K < N determination and adjustment of the K value according to the CLI measurement level, such that K, It increases if the CLI measurement level is higher and the CLI measurement is 30. It decreases if it is lower (Figure 2 - Figure 3); - using the second port group, from the first base station or the second base station One transmitting channel status information reference signal (CSI-RS) to the other; - based on CSI-RS received in the second port group from the other base station, CSI performing the measurement; 35 - the base station that acts between the first and second base stations (110) Access to CSI measurement data; - the base station that acts between the first and second base stations (110) Performing beam zeroing based on CSI measurement data. CLI measurement refers to CLI-Received Signal Strength Indicator (CLI-RSSI) or CLI-Reference Signal. It could be Power Received (CLI-RSRP). Referring to Figure 1, in an arrangement of the invention, the first base station is the influencing base station. base station (110) and the second base station is the affected base station (120). The first base station is 10 The station transmits the CSI-RS to the second base station, and the measurements are taken by the second base station. This is performed by and reported to the first base station. The first base station, In the initial step, Non-Zero Power (NZP) transmits the CSI-RS. In another possible arrangement, the first base station is the influencing base station (110) and 15 The second base station is the affected base station (120). The second base station is the first base station It transmits the CSI-RS to the base station, and the measurements are performed by the first base station. For example, the starting port group might only have one port. This measurement shows the process. It is done by providing efficiency from the outset with minimal resource usage. A high-performance CLI. If the level is detected, the affected base station (120) will receive 20 CLI measurements. Depending on the configuration, NZP transmits CSI-RS with a higher number of ports (e.g., 32 ports). The effect is... base station (110) then uses this CSI-RS to upscale the channel to higher resolution It measures with this. This allows the influencing gNB to beam more effectively in order to reduce interference. It allows the reset process to be performed. Configuration of NZP CSI-RS and ZP CSI-RS sources, central control unit (10) It can be centrally managed by them. In a possible example, referring to Figure 4, there are more than two neighboring base stations. There can be (100) base stations. Each base station (100) can transmit reference signals to each other by 30 It transmits orthogonal NZP CSI-RS signals to prevent interference. Its own NZP CSI-RS. In addition to transmitting, each base station (100) is transmitted by other base stations (100) It configures the corresponding ZP CSI-RS in its own resources, based on the transmitted NZP CSI-RS. This is the ZP CSI-RS resources of each base station (100), other base stations (100). It allows it to measure the CLI on it. 35 11 The configuration of these NZP CSI-RS and ZP CSI-RS resources is done via a network or master node. can be centrally managed by. In this arrangement, all base stations (100), Using ZP CSI-RS, CLI from signals of other base stations (100) While measuring, it simultaneously transmits its own NZP CSI-RS. This step involves 5 bases per unit. caused by transmission from other base stations (100) to the station (100) It enables the initiative to be understood. After measuring CLI levels from other base stations (100) with reference to Figure 5, For example, the first base station might identify itself as affected and the measured interference level might be 10. Depending on the situation, it can label the second and third base stations as having an impact. The second and With CLI levels available from the third base station, the first base station... station, CSI-RS configurations from the influencing base station (110), CSI-RS port You may request that the number be adjusted by increasing or decreasing it. Alternatively, the first one Depending on the base station's request, the second and third base stations can have their own CLI 15 It can determine CSI-RS configurations using its measurements. The base stations (110) that are affected then optionally connect the NZP CSI-RS ports. It configures and sets the number of ports for beam reset optimization. It transmits the updated NZP CSI-RS with the configured port number. Then, the affected 20 The first base station acting as a base station is one of the base stations (110) channel ZP measures on the CSI-RS. Based on these measurements, the primary base station determines the effect. It provides channel feedback to the base station (110). Ultimately, the second and third base stations are 25 kilometers apart from the first base station. Reduce interference on the first base station by using incoming channel feedback. This performs the beam reset operation. The entire process is tracked in real-time via the CLI. It provides dynamic adaptation depending on the measurements and many base stations (100) It improves system performance by effectively reducing interference between them. After measuring CLI levels with reference to Figure 6 and each influencing base station (110) 30 After determining the appropriate number of CSI-RS ports for the affected base station (120), As the next step, each impacting base station (110) is specifically targeted NZP acts to transmit CSI-RS. These reference signals are set to a specific number of ports. It is transmitted via, enabling the base stations (110) to measure the channel. 35 12 In order to provide accurate measurements, the base stations that have an impact (110), the affected base station ZP CSI-RS configured to match NZP CSI-RS transmitted by (120) has. The base stations (110) that have an effect then receive the NZP CSI-RS, with themselves. It can be used to measure the channel characteristics between the affected base station (120). Depending on channel information, the influencing base stations (110) are affected by the base stations 5 (120) can perform beam reset to reduce the interference they cause. This approach involves configuring the number of CSI-RS ports according to the CLI level for various initiatives. It provides a dynamic response and the base stations that are affected (110), the affected base station (120) to adapt their transmissions depending on the correct channel measurements provided by 10 It provides opportunities. The initial step in this arrangement is for each base station (100) to connect to other base stations (100) includes measuring CLI levels. This measurement minimizes resource usage. To do this, a small number of ports are used to transmit the CSI-RS or demodulation reference signal. using any other downlink reference signal (DLRS) such as (DMRS) This is done. By using these signals, each base station (100) determines which base that stations (100) caused interference and to what extent this interference occurred can determine. For example, CLI levels are detected by all base station (100) pairs and After assembly, CSI-RS configurations can be adjusted. Refer to Figure 7 for this. The process can be managed centrally by the central controller (10). Each base station (100), desired for other base stations (100) depending on the measured interference It can report the reference signal configuration. The network or master node can then, for each 25 How to configure CSI-RS resources for base station (100) They can make decisions and balance the needs of all participants. In the regulatory setup, any base station (100), status and intervention Depending on their levels, they can act as both influencing and being influenced. Central 30 Depending on the decisions taken by the controller (10), for each base station (100) The number of CSI-RS ports is set and CSI-RS is transmitted. Each base station (100) is updated. Using the CSI-RS configuration, it measures the channel more precisely and then... It can perform interference mitigation techniques similar to beam resetting. 35 13 The scope of protection of the invention is specified in the attached claims, and examples are provided in this detailed description. It cannot be limited to what has been stated regarding its purposes. The facts mentioned above. In light of this, a person skilled in the technology can create something similar without deviating from the main theme of the invention. It is clear that they can exhibit certain behaviors.

Claims

14 REQUESTS 1. Base capable of communicating using sub-band full duplex (SBFD) technology. Cross-connection attempt (CLI) in a system containing stations (100) This is a method for measuring channels aimed at reducing [the effect of channel measurement], and here we are talking about 5 The subject is base stations (100), N number of channel status information (CSI) ports and to a central controller to control the base stations (100) (10) has the characteristic of including the following steps: - 0 < M <N olacak şekilde, M sayıda porta sahip bir başlangıç port grubu 10 determination, - the starting port of either the first or second base station using the group to give the other channel status information reference signal (CSI- RS) transmission; - 15 based on CSI-RS received in the starting port group of the other base station. performing CLI measurements; - CLI by either the first or second base station Access to measurement data; - A second group of ports with K ports such that M < K < N determination and adjustment of the K value according to the CLI measurement level, so that 20 K increases when the CLI measurement level is higher, and CLI It decreases if the measurement is lower; - using the second port group, the first base station or the second base station one station's channel status information reference signal (CSI- RS) transmission; 25 - based on CSI-RS received from the other base station, second port group Performing CSI measurements; - base station affecting the area between the first and second base stations Access to CSI measurement data by station (110); - Base 30 affecting the area between the first and second base stations. beam based on CSI measurement data by station (110) Performing the reset operation.

2. The method is according to Claim 1, and its characteristic is that the first base station affects the base station. base station (110) and the second base station affected base station (120) It is characterized by being; it includes the following steps: - by the first base station, using the initial port group, the second 5 Transmission of channel status information reference signal (CSI-RS) to the base station; - the second base station, based on CSI-RS received at the starting port group. performing CLI measurements; - CLI measurement data from the first base station by the second base station transmission to the station; 10 - Access to CLI measurement data by the first base station; - A second group of ports with K ports such that M < K < N determining and adjusting the K value according to the CLI measurement level, so K increases when the CLI measurement level is higher, and CLI It decreases if the measurement is lower; 15 - the second base station uses the second port group by the first base station. Transmission of channel status information reference signal (CSI-RS) to the station; - CSI received on the second port group by the second base station. Performing CSI measurement data based on RS; - CSI measurement data from the second base station to the first base 20 transmitted to the station; - Access to CSI measurement data by the primary base station; - beam based on CSI measurement data by the first base station Performing the reset operation.

3. The method is according to Claim 1, and its characteristic is that the first base station affects the base station. base station (110) and the second base station affected base station (120) It is characterized by being; it includes the following steps: - by the second base station, using the initial port group, the first 30 Transmission of channel status information reference signal (CSI-RS) to the base station; - CSI received by the first base station on the initial port group. Performing CLI measurement based on RS; - Access to CLI measurement data by the first base station; 16 - A second group of ports with K ports such that M < K < N determining and adjusting the K value according to the CLI measurement level, so K increases when the CLI measurement level is higher, and CLI It decreases if the measurement is lower; - first base station 5 using second port group by second base station. Transmission of channel status information reference signal (CSI-RS) to the station; - CSI received by the first base station on the second port group. Performing CSI measurements based on RS; - Access to CSI measurement data by the primary base station; - Beam 10 based on CSI measurement data from the first base station. Performing the reset operation.

4. This method, according to claim 1, has the characteristic of having more than two adjacent bases in the system. If the station is available, it should include the following steps: is its characterization; 15 - transmission of CSI-RS orthogonally with each base station; - each base station receives CSI signals transmitted by other base stations. In contrast to RS, in their own resources, CSI-RS by configuring it, other base 20 in their own CSI-RS resources enabling it to measure the CLI caused by the stations; - CLI measurements on CSI-RS sources of each base station relying on itself as the base station that is affected or influences it identification or a central controller's control over CSI-RS resources Based on CLI measurements, base stations can be identified as either victim or attacker base 25. He described it as a station.

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